Darling Muesco [India] Pvt. Ltd. Manufactures Automatic Multi Stage Set-Stop Digital Control Valve. Darling Muesco [India] Pvt. Ltd. Is an ISO 9001:2000 certified company. The Automatic Multi Stage Set-Stop Digital Control Valve is an electrically actuated, hydraulically operated multi-function control valve. This control valve is extensively used in loading terminal automation systems in refineries and storage tanks of petroleum products for effective and accurate filling of tankers and railway wagons. It has two solenoid valves, receiving signal from batch controllers to position the valve for low flow/medium flow / high flow conditions as programmed. The size of Automatic Multi Stage Set-Stop Digital Control Valves ranges from 25NB to 400NB.